linux-kernel - Re: [PATCH 46/50] preempt.h: Kill dependency on list.h

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Date: Sat, 16 Dec 2023 17:35:22 -0500
From: Kent Overstreet <kent.overstreet@...ux.dev>
To: Matthew Wilcox <willy@...radead.org>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org, tglx@...utronix.de, x86@...nel.org,
	tj@...nel.org, peterz@...radead.org, mathieu.desnoyers@...icios.com,
	paulmck@...nel.org, keescook@...omium.org,
	dave.hansen@...ux.intel.com, mingo@...hat.com, will@...nel.org,
	longman@...hat.com, boqun.feng@...il.com, brauner@...nel.org
Subject: Re: [PATCH 46/50] preempt.h: Kill dependency on list.h

On Sat, Dec 16, 2023 at 06:13:41AM +0000, Matthew Wilcox wrote:
> On Fri, Dec 15, 2023 at 10:35:47PM -0500, Kent Overstreet wrote:
> > -	INIT_HLIST_NODE(&notifier->link);
> > +	/* INIT_HLIST_NODE() open coded, to avoid dependency on list.h */
> > +	notifier->link.next = NULL;
> > +	notifier->link.pprev = NULL;
> 
> Arguably INIT_HLIST_NODE() belongs in types.h -- we already have
> RCUREF_INIT() and ATOMIC_INIT() in there.

I think I'd prefer to keep types.h as minimal as possible - as soon as
we start putting non type stuff in there people won't know what the
distinction is and it'll grow.

preempt.h is a bit unusual too, normally we'd just split out a _types.h
header there but it's not so easy to split up usefully.